0.01) and it is because of higher compression ration of tobacco stalks. But in contrast with increasing of tobacco stalks the internal bonding decreases significantly (P>0.05) and it can be attributed to low density and high aspect ratio of tobacco fibers. Meanwhile with increasing press time from 4 to 6 minutes the mechanical properties and internal bounding decreases but water absorption and thickness swelling doesn’t get any changes. Keywords:Particleboard, Tobacco stalk, Mechanical and physical properties, Press time.]]>